| Navy | The US Navy |
| Type | Submarine |
| Class | Balao |
| Pennant | 409 |
| Built by | Portsmouth Navy Yard (Kittery, Maine, U.S.A.) |
| Ordered | 8 Jun 1942 |
| Laid down | 15 Mar 1944 |
| Launched | 26 Jun 1944 |
| Commissioned | 23 Aug 1944 |
| End service | 1 Jul 1970 |
| History | Decommissioned 16 June 1967. |
Commands listed for USS Piper (409)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | T/Cdr. Bernard Francis McMahon, USN | 23 Aug 1944 | 25 Jun 1945 |
| 2 | T/Lt.Cdr. Edward Latimer Beach, Jr., USN | 25 Jun 1945 |
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Notable events involving Piper include:
3 Oct 1944
USS Piper (Cdr. B.F. McMahon, USN) arrived at Newport, Rhode Island from Portsmouth, New Hampshire.
6 Oct 1944
USS Piper (Cdr. B.F. McMahon, USN), departed Newport, Rhode Island for Bar Harbour, Maine to conduct special torpedo firing tests.
7 Oct 1944
USS Piper (Cdr. B.F. McMahon, USN) arrived at Bar Harbour, Maine from Newport, Rhode Island for special torpedo firing tests.
10 Oct 1944
Having completed the special torpedo firing tests, USS Piper (Cdr. B.F. McMahon, USN), departed Bar Harbour, Maine for New London, Connecticut.
11 Oct 1944
USS Piper (Cdr. B.F. McMahon, USN) arrived at New London, Connecticut from Bar Harbour, Maine.
25 Oct 1944
USS Piper (Cdr. B.F. McMahon, USN) departed New London, Connecticut for Key West, Florida.
1 Nov 1944
USS Piper (Cdr. B.F. McMahon, USN) arrived at Key West, Florida from New London, Connecticut.
17 Nov 1944
USS Piper (Cdr. B.F. McMahon, USN) departed Key West, Florida for the Panama Canal Zone.
21 Nov 1944
USS Piper (Cdr. B.F. McMahon, USN) arrived in the Panama Canal Zone from Key West, Florida.
29 Nov 1944
USS Piper (Cdr. B.F. McMahon, USN) departed the Panama Canal Zone for Pearl Harbour.
16 Dec 1944
USS Piper (Cdr. B.F. McMahon, USN) arrived at Pearl Harbour.
25 Jan 1945
With her trials and initial training completed USS Piper (Cdr. B.F. McMahon) departed from Pearl Harbor for her 1st war patrol. She was ordered to patrol south of Japan.
25 Feb 1945
USS Piper (Cdr. B.F. McMahon) sank the Japanese guard boat Hosen Maru No.3 (111 GRT) with gunfire west of Miyake Jima in position 34°06'N, 138°22'E.
30 Mar 1945
USS Piper (Cdr. B.F. McMahon) ended her 1st war patrol at Midway.
26 Apr 1945
USS Piper (Cdr. B.F. McMahon) departed from Midway for her 2nd war patrol. She was ordered to patrol in the Sea of Okhotsk.
13 Jun 1945
USS Piper (Cdr. B.F. McMahon) ended her 2nd war patrol at Pearl Harbor.
19 Jul 1945
USS Piper (Cdr. E.L. Beach) departed from Pearl Harbor for her 3rd war patrol. She was ordered to patrol in the Sea of Japan.
1 Aug 1945
USS Piper (Cdr. E.L. Beach) arrived at Guam.
4 Aug 1945
USS Piper (Cdr. E.L. Beach) departed from Guam for her patrol area.
11 Aug 1945
USS Piper (Cdr. E.L. Beach) sank two small Japanese vessels with gunfire south-west of Kyushu, Japan in position 31°52'N, 129°49'E.
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